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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Removal of H_2S and volatile organic sulfur compounds by silicone membrane extraction
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Removal of H_2S and volatile organic sulfur compounds by silicone membrane extraction

机译：通过硅胶膜萃取去除H_2S和挥发性有机硫化合物

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BACKGROUND: This study explores an alternative process for the abatement and/or desulfurization of H_2S and volatile organic sulfur compounds (VOSC) containing waste streams, which employs a silicone-based membrane to simultaneously remove H_2S and VOSC. An extractive membrane reactor allows the selective withdrawal of VOSC and H_2S simultaneously from the waste stream, while preventing direct contact between the waste stream and the absorbing solution and/or the biological treatment system. The influence of the sulfur compounds, membrane characteristics, extractant and pH was studied. RESULTS: Sulfide and the VOCS studied, i.e. methanethiol (MT), ethanethiol (ET) and dimethylsulfide (DMS) were removed from the synthetic wastewater using a silicone rubber membrane. Methanethiol showed the highest (8.72 x 10~(-6) m s~(-1)) overall mass transfer coefficient (k_(ow)) and sulfide the lowest k_(ow) value (1.23 x 10~(-6) m s~(-1)). Adsorption of the VOCS into the silicone membrane reduced the overall mass transfer coefficient. The k_(ov) when using Fe(III)EDTA~- as extractant (5.81 x 10~(-7) m s~(-1)) for sulfide extraction was one order of magnitude lower than with anaerobic water (2.54 x 10~(-6) m s~(-1)). On the other hand, the sulfide removal efficiency with Fe(III)EDTA~- was higher (84%) compared with anaerobic water (60%) as extractant. An additional mass transfer resistance was formed by elemental sulfur which remained attached to the membrane surface. CONCLUSIONS: Extraction of sulfide and VOCS from a synthetic wastewater solution through a silicone rubber membrane is a feasible process as alternative to the techniques developed to treat VOSC emissions. Optimizing the aqueous absorption liquid can increase the efficiency of extraction based processes.
机译：背景：这项研究探索了一种用于减少和/或脱除H_2S和含有挥发性有机硫化合物（VOSC）的废物流的替代方法，该方法采用基于有机硅的膜同时去除H_2S和VOSC。萃取膜反应器允许同时从废物流中选择性排出VOSC和H_2S，同时防止废物流与吸收溶液和/或生物处理系统直接接触。研究了硫化合物，膜特性，萃取剂和pH的影响。结果：使用硅橡胶膜从合成废水中去除了硫化物和所研究的VOCS，即甲烷硫醇（MT），乙硫醇（ET）和二甲基硫醚（DMS）。甲硫醇的整体传质系数（k_（ow））最大（8.72 x 10〜（-6）ms〜（-1）），而硫化物的k_（ow）值最低（1.23 x 10〜（-6）ms〜 （-1））。 VOCS吸附到有机硅膜中会降低总的传质系数。当使用Fe（III）EDTA〜-作为萃取剂（5.81 x 10〜（-7）ms〜（-1））进行硫化物萃取时的k_（ov）比厌氧水（2.54 x 10〜）低一个数量级。 （-6）毫秒〜（-1））。另一方面，与作为萃取剂的厌氧水（60％）相比，用Fe（III）EDTA〜-去除硫化物的效率更高（84％）。附加的传质阻力是由元素硫形成的，该元素仍然附着在膜表面。结论：通过有机硅橡胶膜从合成废水中提取硫化物和VOCS是可行的方法，可替代开发用于处理VOSC排放物的技术。优化含水吸收液可以提高基于萃取的过程的效率。

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